[time-nuts] Zero-Crossing Detector Design?

[Jim Lux]

On 7/19/12 4:09 PM, Magnus Danielson wrote:
> On 07/20/2012 12:33 AM, lists at lazygranch.com wrote:
>> Are you speaking of slew rate limiting in the strict sense of the
>> word, that is a current starved input stage due to the presence of a
>> compensation cap? Or are you using the term slew more vaguely.
>
> I am speaking neither.
>
> If you have a sine of a particular frequency and amplitude, then you
> have a known slew-rate, it peaks at 2*pi*f*A, where A is the amplitude
> of the sine. As you amplify this signal, the slew-rate will grow
> proportionally. Recall that the jitter of a trigger point is noise
> divided by slew-rate. This is why we want to increase the slew-rate to a
> maximum while adding minimal noise.
>
<snip>
nice simple explanation...